Compressed-air draw molding machine



e. F. GUSTAFSON.

COMPRESSED AIR DRAW MOLDING MACHINE.

APPL ICATXON FILED AUG-8, 1921;

Patent edA'ug. 22, 1922.

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e F. GUSTAFSON.

COMPRESSED AIR DRAW MOLDING MACHINE. APPLICATION FILED AUG.8. 1921.

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Application filed August a, 1e21.- Serial in). 130,761.

one object is to provide almachine of this type that is readily portable and one in which danger of injury to the operator through accident is practically eliminated. A further object is to provide a machine that in operative position stands at such a height above the ground as to permit the operators to work about it without being in the way of one another, and without the necessity of assuming awkward working positions. A still further object is the provision of safety means which prevent the machine being accidently started with r sultant possible injury to the operator or operators.

Vith the foregoing and other objects in view the invention consists in the combination and arrangement of parts to be hereinafter fully described, pointed out .in the appended claims and illustrated in the accompanying drawings which form a part of this application and in which- 1 is a longitudinal sectional view through the machine illustrating its application.

Figs. 2 and 3 are sections taken, respectively, on lines 22 and 33 of Fig. 1.

Fig. i is a section on line 4:& of Fig. 5.

Fig. 5 is a top plan view of the machine, proper, shown in Fig. 1. v

Like reference characters denote corresponding parts throughout the several views.

The reference numeral 1 denotes a foundry pit that receives the piston chamber 2 of my machine, the upper end of said chamber being formed with the flange 3 which is secured by bolts 4 to the table 5 which is formed along the margin of one of its faces with a recess to permit its engagement with and support by the pit plate 6 which encompasses the mouth of the foundry pit, the

central perforation in said plate coinciding with said mouth. The table 5 is formed withthe hub 7 provided with the bushing 8 through which the piston 9 extends, said Specification of Letters Patent. P phgntigd Aug bushingbeing provided with a packing 10 and with the perforated bushing cap 11 that on compasses the piston Within the piston is a partition 12 formed with a lug 13 and. an

expansion. coil spring liencircling saidlug 13extends from the partition 12 to. the base of the piston chamber and steadies the piston in its movements. I

The p1ston9 i31'llfl111t1t6SWlthll1 the piston chamber in the head 15 wherein the air chamber 16 is fo'rmedthat receives compressed air'froni the pipe 17 tapped into "a.

perforation 18 in the table that registers with the said airchamber 16. The pipe 17 is connected by the three-way valve '19 to another air pipe 20 that is tapped intoa perforation 21 in the base of the piston chamber, said air valve 19 receiving air from the intake pipe'22 that connects with a compressed air source, said valve being provided with the control lever23, having the safety latch 24, provided with the valve handle 25 whereby said member and the control lever may be locked in off position so that accidental operation of the mechanism is obviated. The valve 19 is supported by a bracket 26 secured by bolts 27 to the table 5, said valve being provided with the exhausts 17 and 20 for the pipes 17 and 20 respectively. I v

The piston at its upper end is provided with the plate 28 that carries the draw table 29 whereon the pattern rests while in the flask, the flask resting upon the standards 31, 32 that are supported by'and rise fromthe table 5, said standards being formed with the oppositely disposed sockets 33 that receive the grappling hooks when the machine is to .be transported from place to place. Guides 30 secured to the plate 28 extend through guide perforations in the table and steady the plate and tableas they move with the piston. The base of the piston chamber 2 is formedwith raised portions 34 to receive the piston in its lowest position. I

'When the piston is inraised position as shown in Figspl and 4 the flask is placed upon the standards 31, 32 with the pattern, in the sand, resting upon the draw table 29. Air is now introduced into the piston chamber through the pipe 17 thus forcing the piston into thischamber and lowering the draw table and withdrawing the pattern. This movement of the piston is steadied by the spring 14 and guides 30. The air in.

the cnainbcr 2 eiih nstcd through the pipe 550 as th piston descends. fl/hen the hash is removed i"0111 the standards 31, 32 the piston is raised again by introducing air into the chamber 2 through the pipe 20 and the air in the piston is then exhausted throu 'h trio pipe 17. is obvious that the chine, a piston chamber adapted for disposai in a foundry pit, a table supporting n. chamber and adapted to rest mouth of the pit, a piston operative y associated with said piston chamber and working through said table, a partition within said piston, a spring connecting said partition and the base of the piston chamber, a draw table carried by said piston, flask supports carried by the first named table, and means for alternately applying compressed air to opposite sides of the head of said piston whereby reciprocation of the same is effected.

2. In a compressed air draw molding machine, a piston chamber adapted for dis posai in a :toun .ry pit, a pit plate, a table supporting said piston chaniber and resting upon said pit plate, a piston extendingthrou gh s: 7' d table into the said piston chamber, said piston terminating in achambered head, means for supplying compressed air to said chambered head to cause said head to teiescope within said chamber, means for introducing compressed air into said piston chainb r to raise said piston, a draw table carried by said piston, flasksupporting ele ments carried by the first named table and spaced away from said draw table, and spring connection betweensaid piston and the base of the said piston chamber. 7 In testimony that I claim the foregoing as my own I have hereto a'fiixed my signature in the presence of two subscribing witnesses;

GUSTAF F. GUSTAFSON.

Vfitnesses JOHN XV. JOHNSON, JOHN A. CARLsoN. 

